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| Titel: |
Improved Precision in Multi-Angle Laser Light Scattering Data Processing |
| Auteur: |
Laue, C. Hunkeler, D. |
| Verschenen in: |
International journal of polymer analysis & characterization |
| Paginering: | Jaargang 5 (2000) nr. 4-6 pagina's 511-529 |
| Jaar: |
2000-05-01 |
| Inhoud: |
A general method for improving the precision in the estimation of the root-mean-square radius of linear polymer chains in solution from light scattering data has been developed. Specifically, the variance in the estimation of the Rayleigh factors has been found to depend on the concentration of the measured polymer solution. Therefore, with angle-dependent measurement of the Rayleigh factors, at only a single concentration, the root-mean-square radius can be estimated more precisely (3.7%) than if all the concentrations are employed (7.2%), without sacrificing accuracy. With the knowledge of the dependence of the second virial coefficient on molar mass, the root-mean-square radius can be iterated from the Rayleigh factors of the polymer solution with the lowest variance. This has been applied to aqueous polyacrylamide solutions as well as polystyrene in toluene and 2-butanone; the one-concentration method has been found to improve the precision twofold over classical Zimm data treatments. At the same time the measurement time is shortened significantly. It has also been found that the concentration with the lowest variance depends on molar mass of the polymer and an equation to predict this concentration in general for any polymer-solvent combination has been developed. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 11 van 17 gevonden artikelen
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